Polish onboarding and CLI help

CHANGELOG.md

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+# Changelog
+
+All notable user-visible changes to `pyro-mcp` are documented here.
+
+## 2.0.0
+
+- Made guest execution fail closed by default; host compatibility execution now requires
+  explicit opt-in with `--allow-host-compat` or `allow_host_compat=True`.
+- Switched the main CLI commands to human-readable output by default and kept `--json`
+  for structured output.
+- Added default sizing of `1 vCPU / 1024 MiB` across the CLI, Python SDK, and MCP tools.
+- Unified environment cache resolution across `pyro`, `Pyro`, and `pyro doctor`.
+- Kept the stable environment-first contract centered on `vm_run`, `pyro run`, and
+  curated OCI-published environments.
+
+## 1.0.0
+
+- Shipped the first stable public `pyro` CLI, `Pyro` SDK, and MCP server contract.
+- Replaced the old bundled-profile model with curated named environments.
+- Switched distribution to a thin Python package plus official OCI environment artifacts.
+- Published the initial official environment catalog on public Docker Hub.
+- Added first-party environment pull, inspect, prune, and one-shot run flows.